The Washington Park Arboretum in Seattle covers 230 acres of former old growth forest and includes a Japanese garden and a botanical garden. It is divided into dozens of unique sections, much of it heavily canopied. There is Azalea Way, Oak Family, Lindens, Winter Garden, Walnut Family, Viburnums, Magnolia Family, Rhododendron Hybrids and Witch Hazel Family just to name a few. There are over 40000 different species of plants here!
Suspended above one of the many side trails is "Union", an art installation by John Grade. Installed in 2023 it consists of 6300 individual cast resin parts framed in laminated ceiba wood suspended from nets above the trails. Each resin part looks like a magnified cell of a tree.